EP1047280B1 - Kommunikationssystemen - Google Patents

Kommunikationssystemen Download PDF

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Publication number
EP1047280B1
EP1047280B1 EP00302489A EP00302489A EP1047280B1 EP 1047280 B1 EP1047280 B1 EP 1047280B1 EP 00302489 A EP00302489 A EP 00302489A EP 00302489 A EP00302489 A EP 00302489A EP 1047280 B1 EP1047280 B1 EP 1047280B1
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EP
European Patent Office
Prior art keywords
data
atm
cell
field
communications system
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Expired - Lifetime
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EP00302489A
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English (en)
French (fr)
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EP1047280A3 (de
EP1047280A2 (de
Inventor
Richard John Proctor
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Ericsson AB
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Ericsson AB
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Publication of EP1047280A3 publication Critical patent/EP1047280A3/de
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0478—Provisions for broadband connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5603—Access techniques
    • H04L2012/5609—Topology
    • H04L2012/5613—Bus (including DQDB)
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5646—Cell characteristics, e.g. loss, delay, jitter, sequence integrity
    • H04L2012/5652—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly
    • H04L2012/5653—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly using the ATM adaptation layer [AAL]
    • H04L2012/5656—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly using the ATM adaptation layer [AAL] using the AAL2

Definitions

  • the present invention relates to the field of communications and in particular to a communications system for the transport of ATM and AAL2-type signals.
  • UTOPIA The Universal Test and Operations PHY Interface for ATM (UTOPIA) bus defines an interface between the physical layer (PHY) and upper layer modules such as the ATM layer and various management entities in an ATM communications system.
  • PHY physical layer
  • UTOPIA level 1 is defined in "UTOPIA, an ATM-PHY Interface” specification level 1, version 2.01, March 21 1994 (af-phy-0017.000)
  • UTOPIA level 2 is defined in af-phy-0039.000, June 1995.
  • the UTOPIA bus structure supports ATM cells.
  • UTOPIA level 2 also allows for shared interfaces that support many devices.
  • UTOPIA comprises a data bus for carrying ATM cells and sufficient control information to control access to the interfaces. The control information may be carried via the data bus or using external control signals in parallel with the data bus.
  • UTOPIA level 1 supports data rates up to 155Mbit/s via an 8bit data bus.
  • UTOPIA level 2 supports data rates of up to 622Mbit/s via an 8 or 16 bit data bus.
  • AAL2 AAL2 mini-cells
  • CPS common part sub-layer
  • the present invention provides a communications system comprising a common device and a plurality of higher layer devices connected via a bus for the communication of data traffic between the common device and the higher layer devices in which the bus comprises lines for carrying data and control signals; characterised in that the data traffic comprises data in ATM form and data in AAL2 form; in which the devices comprise discrimination means for discriminating between the two forms of data traffic, and in which the data in AAL2 form comprises an AAL2 mini-cell associated with a means of identification of the source or destination of the mini-cell.
  • the invention also provides a method for the communication of data traffic via a bus between a common device and a plurality of higher layer devices; in which the bus comprises lines for carrying data and control signals; characterised in that the data traffic comprises data in ATM form and data in AAL2 form; the method comprising the step of discriminating between the two forms of data traffic, and in which the data in AAL2 form comprises an AAL2 mini-cell associated with a means of identification of the source or destination of the mini-cell.
  • the invention provides a method for the communication of data traffic via a bus between one or more common devices and a plurality of higher layer devices; in which the bus comprises lines for carrying data, control and address signals; in which the address signals are for selecting a device from more than one common device or from the plurality of higher layer devices; characterised in that the data traffic comprises data in ATM form and data in AAL2 form; the method comprising the step of discriminating between the two forms of data traffic, and in which the data in AAL2 form comprises an AAL2 mini-cell associated with a means of identification of the source or destination of the mini-cell.
  • the ATM layer is linked via the UTOPIA bus to the physical (PHY) layer by means of a data bus in each direction and a set of control signals in each direction.
  • PHY physical
  • control signals are defined as part of the UTOPIA buses (both 8 and 16 bit).
  • the start-of-cell signal (RxSOC) is active for one clock cycle when the receive data contains the first valid octet of a cell.
  • the enable signal (RxEnb)
  • the receive empty/cell available signal (RxEMPTY/RxClav).
  • the transmit start-of-cell signal (TxSOC) is activated for one clock cycle by the ATM layer when the first valid octet of a cell is put on the transmit data bus. Also defined are the transmit enable signal (TxEnb) and the transmit full/cell available signal (TxFull/Clav).
  • TxClk The transmit clock (TxClk) is provided by the ATM layer for synchronising transmit data transfers.
  • address lines may be present to enable selection by the ATM layer interface of a particular PHY layer interface from a plurality of the same and/or to enable selection by the PHY layer interface of a particular ATM layer interface from a plurality of the same.
  • Figure 2 shows the format of a UTOPIA cell as defined for the 8 bit mode and Figure 3 shows the cell format for the 16 bit mode.
  • the cell format comprises four octets of header, one user defined octet (UDF) and forty-eight octets of payload.
  • the cell format comprises four octets of header, two user defined octets (UDF 1, UDF2) and again forty-eight octets of payload.
  • the UDF fields received may carry header error correction (HEC) information. However this information is not used and thus the field may be overwritten for the purposes of the present invention.
  • HEC header error correction
  • FIG. 4 shows the AAL2 mini-cell (CPS packet).
  • the AAL2 mini-cell comprises three octets of header (CPS-PH) and a variable length payload.
  • the header comprises the channel identifier (CID) the length indicator (LI) which defines the length of the mini-cell payload, the user-to-user indication (UUI) and the header error control (HEC).
  • CID channel identifier
  • LI length indicator
  • UUI user-to-user indication
  • HEC header error control
  • the mini-cell payload and, as a result the mini-cell itself, is variable in length and interfaces processing such mini-cells use the length indication (LI) field to check the length of the mini-cell.
  • FIG. 5 shows a bus according to the present invention.
  • the bus is shown joining a number of higher layer devices including ATM layer devices and AAL2 layer devices with a single physical layer (PHY) device.
  • the number of higher layer devices is not restricted except that there must be at least one of each type in communication with the bus.
  • a plurality of physical layer (PHY) devices may be connected via the bus to a small number of higher layer devices.
  • FIG. 6a shows the format of an information structure comprising a mini-cell according to an embodiment of the present invention.
  • the mini-cell comprises four octets of ATM cell header, one octet of UDF, together with a mini-cell.
  • the ATM header comprises the following fields, as defined in the relevant standards, GFC, VPI, VCI, PTI and CLP.
  • the CPS packet comprises the CPS packet header (CPS-PH) as described above with reference to Figure 4 and the rest of the mini-cell comprises the variable length CPS payload which may be between 1 and 64 bytes long.
  • the functions of the CPS packet header are as described above and will not be described further here.
  • the ATM cell header comprises virtual path identity (VPI) and virtual channel identity (VCI) information to allow identification of the appropriate ATM virtual path and virtual channel for the mini-cell.
  • VPN virtual path identity
  • VCI virtual channel identity
  • Figure 6b shows the format of an information structure comprising a mini-cell according to a further embodiment of the present invention.
  • the information structures of Figures 6a and 6b are very similar, the difference being that in the information structure of Figure 6b , the UDF of the ATM header is omitted, thereby saving one octet.
  • the discrimination between ATM and mini-cell data traffic is based on the contents of fifth octet of the information structure.
  • this is the UDF and in the arrangement of Figure 6b the CID.
  • the contents of this octet would then be interpreted as follows. Where the content of the octet is zero it is interpreted as a valid ATM UDF and a normal ATM cell will be expected to follow. Where the content of the octet is non-zero, an AAL2 CID mini-cell will be expected to follow.
  • the next octet i.e. the sixth
  • the non-zero value of the fifth octet is the CID octet and will be read to identify the channel.
  • the above arrangement is compatible with the ITU-T definition of mini-cells where a zero value of CID is not used for channel identification.
  • Figure 7 shows the format of an information structure in the form of a mini-cell according to a second embodiment of the present invention.
  • the lower part of the information structure of Figure 7 comprises the CPS packet similar to that described above in relation to the embodiment of Figure 6 , however instead of the ATM header octets, the upper part of the information structure now comprises a PCM number for identifying a pulse code modulation (PCM) and a PCM circuit number for identifying a PCM circuit over which the mini-cell is to be routed.
  • PCM pulse code modulation
  • PCM circuit number for identifying a PCM circuit over which the mini-cell is to be routed.
  • the PCM information could be replaced with the identity of a synchronous digital hierarchy (SDH) virtual container.
  • SDH synchronous digital hierarchy
  • Each interface to the bus may be arranged to use a control signal from the bus for discriminating between the two forms of data traffic.
  • the control signal is the start of cell (SOC) signal.
  • SOC start of cell
  • the signal is defined in the UTOPIA recommendations as going active for a single cycle of the relevant synchronising clock signal (i.e. either RxC1k or TxC1k) to indicate the start of an ATM cell.
  • the SOC signal is defined as going active for two successive cycles of the relevant synchronising clock signal to indicate transmission of a mini-cell.
  • an additional signal may be provided on the bus, i.e. in addition to those defined in UTOPIA recommendations for this purpose.
  • the discrimination means comprises means to use a field of the data traffic for discriminating between the two forms of data traffic.
  • the field used is the user defined field (UDF) in the ATM data or the CID field in the AAL2 data.
  • the AAL2 CID field has no defined meaning for a zero value (other than as null filler) which should never be seen in a valid mini-cell, whereas the content of the ATM UDF field is arbitrary and could, according to a further embodiment, be used to discriminate between more than two forms of data.
  • the interfaces are advantageously adapted, according to this invention, to identify the position in the data stream of UDF and CID octets and to interpret the associated data according the value found in those octets.
  • the second octet of a 16 bit UDF field could be used for this purpose.
  • the contents of the VPI field or the VPI and VCI fields taken in combination is used to discriminate between the two forms of data traffic.
  • VPs or VP/VC combinations are allocated according to the type of data traffic to be carried.
  • only the top bit of the VPI field would be used in this way, e.g. with a value of zero indicating an ATM cell and a value of one indicating a mini-cell.
  • each mini-cell forms part of an ATM virtual path (VP) and/or virtual channel (VC) and the identity of the relevant VP or VC must be transferred across the bus in association with each mini-cell.
  • a VP indication (VPI) field and a VC indication (VCI) field are defined in ATM standards for the purpose of identifying VPs and VCs respectively.
  • each mini-cell transported via the bus is associated with an ATM header comprising a virtual path indication (VPI) field and a virtual channel indication (VCI) field for use for determining the relevant VP and VC.
  • the form of data traffic is discriminated by a combination of two or more of the above means.
  • the present invention is also applicable to other types of bus, such as UTOPIA levels 3 and 4.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Selective Calling Equipment (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Communication Control (AREA)
  • Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)

Claims (31)

  1. Kommunikationssystem, umfassend eine gemeinsame Vorrichtung und eine Mehrzahl von Vorrichtungen der oberen Schichten, die über einen Bus zur Übertragung von Datenverkehr zwischen der gemeinsamen Vorrichtung und den Vorrichtungen der oberen Schichten verbunden sind, wobei der Bus Leitungen zum Übermitteln von Daten und Steuersignalen umfasst; dadurch gekennzeichnet, dass der Datenverkehr Daten in ATM-Form und Daten in AAL2-Form umfasst; wobei die Vorrichtungen Unterscheidungsmittel zum Unterscheiden zwischen den beiden Formen von Datenverkehr umfassen, und wobei die Daten in AAL2-Form eine AAL2-Kleinzelle umfassen, die mit einem Mittel zur Identifikation des Ursprungs oder des Ziels der Kleinzelle assoziiert ist.
  2. Kommunikationssystem nach Anspruch 1, wobei das Identifikationsmittel einen ATM-Kopf umfasst.
  3. Kommunikationssystem nach Anspruch 2, wobei die Daten in AAL2-Form mit einem virtuellen ATM-Pfad (VP) und einem virtuellen ATM-Kanal (VC) assoziiert sind, wobei der ATM-Kopf ein Feld der Kennung des virtuellen Pfades (VPI) und ein Feld der Kennung des virtuellen Kanals (VCI) umfasst; die VPI- und VCI-Felder zur Verwendung zum Bestimmen des assoziierten VPs bzw. VCs.
  4. Kommunikationssystem nach Anspruch 1, wobei das Identifikationsmittel eine Pulscodemodulations (PCM)-Schaltungskennung umfasst.
  5. Kommunikationssystem nach Anspruch 1, wobei das Identifikationsmittel die Identität eines virtuellen Synchron-Digital-Hierarchie (SDH)-Containers umfasst.
  6. Kommunikationssystem nach einem der vorhergehenden Ansprüche, wobei die gemeinsame Vorrichtung eine physikalische ATM-Schicht (PHY) umfasst, und die Mehrzahl von Vorrichtungen der oberen Schichten eine ATM-Schicht und eine AAL2-Schicht umfasst.
  7. Kommunikationssystem nach einem der vorhergehenden Ansprüche, wobei das Unterscheidungsmittel Mittel zum Verwenden eines Steuersignals vom Bus zum Unterscheiden zwischen den beiden Formen von Datenverkehr umfasst.
  8. Kommunikationssystem nach Anspruch 7, wobei das Steuersignal das Zellbeginn (SOC)-Signal ist.
  9. Kommunikationssystem nach Anspruch 8, wobei die Unterscheidungsmittel Mittel zum Unterscheiden zwischen den beiden Formen von Verkehr in Abhängigkeit von der Anzahl von Taktzeiten, die das SOC-Signal aktiv ist, umfassen.
  10. Kommunikationssystem nach einem der Ansprüche 1 bis 6, wobei das Unterscheidungsmittel Mittel zum Verwenden eines Feldes des Datenverkehrs zum Unterscheiden zwischen den beiden Form von Datenverkehr umfasst.
  11. Kommunikationssystem nach Anspruch 10, wobei der Datenverkehr ein benutzerdefiniertes Feld (UDF) umfasst, wobei das Feld zur Verwendung zum Unterscheiden das UDF ist.
  12. Kommunikationsvorrichtung nach Anspruch 10, wobei die Daten in AAL2-Form eine AAL2-Kleinzelle umfassen, und die Daten in ATM-Form eine ATM-Zelle umfassen, wobei das Feld zur Verwendung zum Unterscheiden das fünfte Oktett der Zellen umfasst.
  13. Kommunikationssystem nach Anspruch 12, wobei das fünfte Oktett der AAL-Kleinzelle ein Kanalidentifikations (CID)-Feld umfasst.
  14. Kommunikationssystem nach einem der vorhergehenden Ansprüche, wobei der Bus Leitungen zum Übermitteln von Adresssignalen zum Auswählen einer Vorrichtung aus der Mehrzahl von Vorrichtungen der oberen Schichten umfasst.
  15. Kommunikationssystem nach einem der vorhergehenden Ansprüche, umfassend eine Mehrzahl von gemeinsamen Vorrichtungen, wobei der Bus Leitungen zum Übermitteln von Adresssignalen zum Auswählen einer Vorrichtung aus der Mehrzahl von gemeinsamen Vorrichtungen umfasst.
  16. Verfahren zur Übertragung von Datenverkehr über einen Bus zwischen einer gemeinsamen Vorrichtung und einer Mehrzahl von Vorrichtungen der oberen Schichten, wobei der Bus Leitungen zum Übermitteln von Daten und Steuersignalen umfasst; dadurch gekennzeichnet, dass der Datenverkehr Daten in ATM-Form und Daten in AAL2-Form umfasst; das Verfahren umfassend den Schritt des Unterscheidens zwischen den beiden Formen von Datenverkehr, und wobei die Daten in AAL2-Form eine AAL2-Kleinzelle umfassen, die mit einem Mittel zur Identifikation des Ursprungs oder des Ziels der Kleinzelle assoziiert ist.
  17. Verfahren nach Anspruch 16, wobei der Bus Leitungen zum Übermitteln von Adresssignalen umfasst; wobei die Adresssignale zum Auswählen einer Vorrichtung aus mehr als einer gemeinsamen Vorrichtung oder aus der Mehrzahl von Vorrichtungen der oberen Schichten sind.
  18. Verfahren nach Anspruch 16 oder 17, wobei das Identifikationsmittel einen ATM-Kopf umfasst.
  19. Verfahren nach Anspruch 18, wobei das Identifikationsmittel ein VCI-Feld und/oder ein VPI-Feld umfasst.
  20. Verfahren nach Anspruch 16 oder 17, wobei das Identifikationsmittel eine PCM-Schaltungskennung umfasst.
  21. Verfahren nach Anspruch 16 oder 17, wobei das Identifikationsmittel die Identität eines virtuellen SDH-Containers umfasst.
  22. Verfahren nach einem der Ansprüche 16 bis 21, wobei die oder jede gemeinsame Vorrichtung eine physikalische ATM-Schicht (PHY) umfasst, und die Mehrzahl von Vorrichtungen der oberen Schichten eine ATM-Schicht und eine AAL2-Schicht umfasst.
  23. Verfahren nach einem der Ansprüche 16 bis 21, umfassend den Schritt des Verwendens eines Steuersignals des Busses zum Unterscheiden zwischen den beiden Formen von Datenverkehr.
  24. Verfahren nach Anspruch 23, wobei das Steuersignal das Zellbeginn (SOC)-Signal ist.
  25. Verfahren nach Anspruch 24, umfassend die Schritte des Überwachens des SOC-Signals und des Unterscheidens zwischen den beiden Formen von Daten auf der Basis der Anzahl von Taktzeiten, die das SOC-Signal aktiv ist.
  26. Verfahren nach Anspruch 23, wobei das Steuersignal ein zusätzliches Signal ist.
  27. Verfahren nach einem der Ansprüche 16 bis 22, umfassend den Schritt des Verwendens eines Feldes des Datenverkehrs zum Unterscheiden zwischen den beiden Formen von Datenverkehr.
  28. Verfahren nach Anspruch 27, wobei der Datenverkehr ein UDF umfasst, wobei das Feld zur Verwendung zum Unterscheiden das UDF ist.
  29. Verfahren nach Anspruch 27, wobei die Daten in AAL2-Form eine AAL2-Kleinzelle umfassen, und wobei die Daten in ATM-Form eine ATM-Zelle umfassen, das Verfahren umfassend den Schritt des Verwendens des fünften Oktetts der Zellen zum Unterscheiden.
  30. Verfahren nach Anspruch 27, wobei das Feld zur Verwendung zum Unterscheiden das VCI-Feld und/oder das VPI-Feld ist.
  31. Verfahren nach Anspruch 27, wobei der Datenverkehr ein PCM-Feld umfasst, wobei das Feld zur Verwendung zum Unterscheiden das PCM-Feld ist.
EP00302489A 1999-04-19 2000-03-27 Kommunikationssystemen Expired - Lifetime EP1047280B1 (de)

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GB9908848 1999-04-19
GB9908848A GB2349294B (en) 1999-04-19 1999-04-19 Communications system

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EP1047280A2 EP1047280A2 (de) 2000-10-25
EP1047280A3 EP1047280A3 (de) 2003-08-27
EP1047280B1 true EP1047280B1 (de) 2010-07-28

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AT (1) ATE476062T1 (de)
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US6393025B1 (en) * 1999-08-09 2002-05-21 Lucent Technologies Inc. Time-sensitive packet processor for an ATM switch
US6801542B1 (en) * 1999-08-19 2004-10-05 Nokia Corporation Method and apparatus for providing an interworking unit between ATM networks and IP networks

Also Published As

Publication number Publication date
US7050442B1 (en) 2006-05-23
GB9908848D0 (en) 1999-06-16
DE60044734D1 (de) 2010-09-09
GB2349294A (en) 2000-10-25
EP1047280A3 (de) 2003-08-27
ATE476062T1 (de) 2010-08-15
EP1047280A2 (de) 2000-10-25
GB2349294B (en) 2001-07-11

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